TW202025555A - Multi-antenna system and electronic device thereof - Google Patents

Abstract

A multi-antenna system and an electronic device thereof are provided. The system includes a ground plane, main antenna unit, a first sub-antenna unit, a second sub-antenna unit, a switching circuit, and a wireless communication module. The ground plane includes four sides connected to each other. The main antenna unit is disposed on either side of the four sides. The first sub-antenna unit is disposed on either side of the four sides and the first sub-antenna unit is separated from the main antenna unit by a distance which is greater than 0.5-wavelength of a lower operating frequency of the multi-antenna system. The second sub-antenna unit is disposed on either side of the four sides where the main antenna unit is not disposed. The switching circuit is disposed on the ground plane and is selectively electrically connected to the first sub-antenna unit or the second sub-antenna unit. The wireless communication module is disposed on the ground plane and electrically connected to the switching circuit and the main antenna unit.

Description

Multi-antenna system and its electronic device

This case is about a multi-antenna system and its electronic device.

It is applied to mobile devices such as notebook computers, tablet computers, and mobile phones, and most of them are built-in antennas, and in the internal space of the device, a specific antenna space needs to be reserved. However, as mobile devices are required to be lighter, thinner, and easy to carry, as well as to emphasize the aesthetics and texture of products in industrial design, their appearance designs often use metal or conductive materials, often due to space or Insufficient headroom area leads to a significant decrease in the radiation characteristics of the antenna, and sufficient headroom area results in an increase in the thickness of the device. The antenna design will face the challenge of a harsh environment with the aforementioned requirements.

This case provides a multi-antenna system including a conductive surface, a main antenna unit, a first auxiliary antenna unit, a second auxiliary antenna unit, a switching circuit, and a wireless communication module. The conductive surface has four sides adjacent to each other. The main antenna unit is arranged on any one of the four sides. The first sub-antenna unit is arranged on any one of the four sides, and the first sub-antenna unit is separated from the main antenna unit by an interval greater than 0.5 times the wavelength distance of the low-frequency operating frequency. The second auxiliary antenna unit is arranged on any side of the four sides of the conductive surface where the main antenna unit is not arranged. The switching circuit is arranged on the conductive surface and is selectively electrically connected to the first auxiliary antenna unit or the second auxiliary antenna unit. The wireless communication module is arranged on the conductive surface and is electrically connected to the switching circuit and the main antenna unit. Wherein, when the switching circuit is electrically connected to the first auxiliary antenna unit, the main antenna unit and the first auxiliary antenna unit form a first antenna combination; when the switching circuit is electrically connected to the second auxiliary antenna unit, the main antenna unit and the first antenna unit The two antenna units form a second antenna combination; and when a radio frequency signal is fed into the second antenna combination, the radiation pattern generated by the second antenna unit has a polarization direction orthogonal to the radiation pattern generated by the main antenna unit Polarization direction.

This case also provides an electronic device, including a system body, a conductive surface, a main antenna unit, a first auxiliary antenna unit, a second auxiliary antenna unit, a switching circuit, and a wireless communication module. The conductive surface is arranged in the system body and has four sides adjacent to each other. The main antenna unit is arranged on any one of the four sides. The first sub-antenna unit is arranged on any one of the four sides, and the first sub-antenna unit is separated from the main antenna unit by an interval greater than 0.5 times the wavelength distance of the low-frequency operating frequency. The second auxiliary antenna unit is arranged on any side of the four sides of the conductive surface where the main antenna unit is not arranged. The switching circuit is arranged on the conductive surface and is selectively electrically connected to the first auxiliary antenna unit or the second auxiliary antenna unit. The wireless communication module is arranged on the conductive surface and is electrically connected to the switching circuit and the main antenna unit. Wherein, when the switching circuit is electrically connected to the first auxiliary antenna unit, the main antenna unit and the first auxiliary antenna unit form a first antenna combination; when the switching circuit is electrically connected to the second auxiliary antenna unit, the main antenna unit and the first antenna unit The two antenna units form a second antenna combination; and when a radio frequency signal is fed into the second antenna combination, the radiation pattern generated by the second antenna unit has a polarization direction orthogonal to the radiation pattern generated by the main antenna unit Polarization direction.

Please refer to FIG. 1. FIG. 1 shows a multi-antenna system 1 having a high-frequency operating frequency and a low-frequency operating frequency. The multi-antenna system 1 includes a conductive surface 11 and a main antenna unit 12 disposed on the conductive surface 11, a first sub-antenna unit 13, a second sub-antenna unit 14, a switching circuit 27 and a wireless communication module 26. The main antenna unit 12 is connected to the wireless communication module 26, the wireless communication module 26 is connected to the switching circuit 27, and the switching circuit 27 is connected to the first auxiliary antenna unit 13 and the second auxiliary antenna unit 14. The switching circuit 27 is selectively electrically connected to the first auxiliary antenna unit 13 or the second auxiliary antenna unit 14. When the switching circuit 27 is electrically connected to the first auxiliary antenna unit 13, the main antenna unit 12 and the first auxiliary antenna unit 13 form a first antenna combination by the electrical connection between the switching circuit 27 and the wireless communication module 26. When the switching circuit 27 is electrically connected to the second auxiliary antenna unit 14, the main antenna unit 12 and the second auxiliary antenna unit 14 form a second antenna combination by the electrical connection between the switching circuit 27 and the wireless communication module 26. Please refer to Figure 2. Figure 2 illustrates the functional schematic diagram of an implementation aspect of the multi-antenna system 1 of Figure 1 (Figure 2 is only for illustration, and the conductive surface 11 is not drawn). As mentioned above, the wireless communication module The group 26 is electrically connected to the main antenna unit 12 and the switching circuit 27. Therefore, when the switching circuit 27 is electrically connected to the first auxiliary antenna unit 13, the multi-antenna system 1 uses the main antenna unit 12 and the first auxiliary antenna unit 13 The first antenna combination is formed to transmit and receive wireless signals. When the switching circuit 27 is electrically connected to the second sub-antenna unit 14, the multi-antenna system 1 is formed by the main antenna unit 12 and the second sub-antenna unit 14. Wire combination to send and receive wireless signals.

In one embodiment, the conductive surface 11 is the grounding portion of the metal casing of the electronic device or the metal sputtering portion inside the plastic casing of the electronic device, but it is not limited thereto.

Please refer to Figure 1 and Figures 3 to 9 together. 3 to 9 are only used to illustrate the layout of the main antenna unit 12, the first sub-antenna unit 13 and the second sub-antenna unit 14 on the conductive surface 11, and the wireless communication module 26 and the switch on the conductive surface 11 are omitted. Circuit 27. As shown in Figure 1 and Figures 3 to 9, the conductive surface 11 has four sides adjacent to each other (for convenience of description, hereinafter referred to as the first side 111, the second side 112, the third side 113, and the first side Four sides 114). The main antenna unit 12 can be arbitrarily arranged on any of the aforementioned four sides 111, 112, 113, and 114. For example, as shown in FIGS. 1, 3, 6, 7, 8, and 9, the main antenna unit 12 extends along the first side 111 and is disposed on the first side 111, as shown in FIGS. 4 and 5. The main antenna unit 12 extends along the second side 112 and is disposed on the second side 112. In other embodiments, the main antenna unit 12 can also extend along the third side 113 or the fourth side 114 and be disposed on the third side 113 or the fourth side 114, without referring to FIGS. 1 and 3 to The example in Figure 9 is limited.

The first antenna unit 13 can also be arbitrarily arranged on any one of the aforementioned four sides 111, 112, 113, 114. For example, as shown in FIG. 7, the first auxiliary antenna unit 13 is extended along the first side 111 and arranged on the first side 111, as shown in FIGS. 4, 5, and 8, the first auxiliary antenna unit 13 It extends along the second side 112 and is arranged on the second side 112. As shown in Figures 1, 3, 6, and 9, the first sub-antenna unit 13 extends along the third side 113 and is arranged on the third side. Side 113. In other embodiments, the first auxiliary antenna unit 13 can also extend along the fourth side 114 and be disposed on the fourth side 114. Further, the first sub-antenna unit 13 and the main antenna unit 12 are separated by a distance D1. In order for the multi-antenna system 1 to have the characteristics of spatial diversity, the distance D1 must be at least greater than 0.5 times the wavelength distance of the low-frequency operating frequency . In one embodiment, the distance D1 is measured from the center of the main antenna unit 12 on the structure to the center of the first antenna unit 13 on the structure.

The second auxiliary antenna unit 14 is arranged on any side of the four sides 111, 112, 113, 114 where the main antenna unit 12 is not arranged. In some embodiments, when the main antenna unit 12 is disposed on the first side 111, the second auxiliary antenna unit 14 can be disposed on the second side 112, the third side 113, or the fourth side 114; when the main antenna When the unit 12 is arranged on the second side 112, the second auxiliary antenna unit 14 can be arranged on the first side 111, the third side 113 or the fourth side 114. When the main antenna unit 12 is disposed on the third side 113, the second auxiliary antenna unit 14 can be disposed on the first side 111, the second side 112 or the fourth side 114. When the main antenna unit 12 is disposed on the fourth side 114, the second auxiliary antenna unit 14 can be disposed on the first side 111, the second side 112 or the third side 113. As shown in FIGS. 1, 3, 7, and 8, the second auxiliary antenna unit 14 extends along the second side 112 where the main antenna unit 12 is not provided, and a second side 112 is provided. As shown in FIG. 4, the second auxiliary antenna unit 14 extends along the first side 111 where the main antenna unit 12 is not provided, and is arranged on the first side 111. As shown in FIGS. 5 and 9, the second auxiliary antenna unit 14 extends along the third side 113 where the main antenna unit 12 is not provided and is arranged on the third side 113. As shown in FIG. 6, the second auxiliary antenna unit 14 extends along the fourth side 114 where the main antenna unit 12 is not provided, and is arranged on the fourth side 114. In order for the multi-antenna system 1 to have polarization diversity characteristics, when the radio frequency signal is fed into the aforementioned second antenna combination, the polarization direction of the radiation pattern generated by the second antenna unit 14 needs to be orthogonal to The radiation field generated by the main antenna unit 12 is a polarization direction.

Based on this, the switching circuit 27 can select the first antenna unit 13 or the second antenna unit 14 through a switching method of one of two, and use the processor included in an electronic device of the multi-antenna system 1 to real-time through software algorithms. Determine the throughput of received data and control the switching circuit 27 to select the first sub-antenna unit 13 or the second sub-antenna unit 14 to be combined with the main antenna unit 12, so that the wireless communication module 26 can use the main antenna unit 12 and the first sub-antenna unit 12 The antenna unit 13 can send and receive wireless signals, or the wireless communication module 26 can use the main antenna unit 12 and the second sub-antenna unit 14 to send and receive wireless signals, thereby combining the best communication coverage, regardless of the first day The line combination or the second antenna combination, the multi-antenna system 1 has a dual-frequency operation mode. Therefore, the multi-antenna system 1 includes a small number of antenna elements (only three antenna elements) and occupies less space. The multi-antenna system 1 can be applied to today's notebook computers with light, thin, and narrow frame requirements. Improve the efficiency of sending and receiving wireless signals.

In an embodiment, the main antenna unit 12, the first sub-antenna unit 13 and the second sub-antenna unit 14 may be a dipole antenna, a slot antenna, a loop antenna or a plane inverted antenna, respectively. F antenna (planar inverted-F antenna; PIFA). Furthermore, the main antenna unit 12, the first auxiliary antenna unit 13, and the second auxiliary antenna unit 14 can be manufactured by a printed circuit board (PCB) process, a flexible printed circuit board (FPCB) process, or a laser direct molding (LDS) process. to make. Furthermore, the aforementioned low-frequency operating frequency and high-frequency operating frequency may cover 2.4 GHz and 5 GHz operating frequency bands, respectively.

In one embodiment, please refer to FIG. 11 and FIG. 12. FIG. 11 is an electronic device 2 using the multi-antenna system 1, and the electronic device 2 is a notebook computer as an example. The electronic device 2 includes a screen body 21 and a system body 22. In one embodiment, the screen body 21 includes a screen 23 and the system body 22 includes input devices such as a keyboard 24 and a touchpad 25 and a motherboard 28. The antenna system 1 is located in the system body 22. Based on this, the antenna system 1 installed in the system body 22 is not limited by the electronic device 2 with light, thin and narrow frame requirements, and the antenna system 1 can be better applied to the current electronic devices with light, thin and narrow frame requirements 2.

In one embodiment, the screen body 21 and the system body 22 of the electronic device 2 are made of metal. In this case, at least one of the upper system casing 221 or the lower system casing 222 of the system body 22 can be used as a conductive surface 11; In other embodiments, the material of the screen body 21 and the system body 22 is plastic, at this time, the conductive surface 11 can be the metal of the upper system casing 221 or the lower system casing 222 of the plastic material Sputtering department. In this embodiment, the conductive surface 11 is rectangular, that is, the first side 111 of the conductive surface 11 is parallel to the third side 113, and the first side 111 is perpendicular to the second side 112 and the fourth side. 114. The second side 112 is parallel to the fourth side 114.

The following further describes the placement of each antenna element 12, 13, 14 on the conductive surface 11 based on the rectangular conductive surface 11.

As shown in Figures 1 and 3, the length direction of the main antenna unit 12 is parallel to the first side 111, the length direction of the first auxiliary antenna unit 13 is parallel to the third side 113, and the second auxiliary antenna unit 14 The length direction of is parallel to the second side 112. Based on this, according to the rectangular conductive surface 11, the length direction of the first auxiliary antenna element 13 is parallel to the length direction of the main antenna element 12, and the length direction of the second auxiliary antenna element 14 is perpendicular to the length direction of the main antenna element 12. And it is perpendicular to the length direction of the first sub-antenna unit 13.

As shown in FIG. 4, the length direction of the main antenna unit 12 and the length direction of the first auxiliary antenna unit 13 are parallel to the second side 112, and the length direction of the second auxiliary antenna unit 14 is parallel to the first side 111. Based on this, according to the rectangular conductive surface 11, the length direction of the first auxiliary antenna element 13 is parallel to the length direction of the main antenna element 12, and the length direction of the second auxiliary antenna element 14 is perpendicular to the length direction of the main antenna element 12. And it is perpendicular to the length direction of the first sub-antenna unit 13.

As shown in FIG. 5, the length direction of the main antenna unit 12 and the length direction of the first auxiliary antenna unit 13 are parallel to the second side 112, and the length direction of the second auxiliary antenna unit 14 is parallel to the third side 113. According to the rectangular conductive surface 11, the length direction of the first auxiliary antenna element 13 is parallel to the length direction of the main antenna element 12, and the length direction of the second auxiliary antenna element 14 is perpendicular to the length direction of the main antenna element 12 and perpendicular to The length direction of the first sub antenna unit 13.

As shown in FIG. 6, the length direction of the main antenna unit 12 is parallel to the first side 111, the length direction of the first sub antenna unit 13 is parallel to the third side 113, and the length direction of the second sub antenna unit 14 is Parallel to the fourth side 114. Based on this, according to the rectangular conductive surface 11, the length direction of the first auxiliary antenna element 13 is parallel to the length direction of the main antenna element 12, and the length direction of the second auxiliary antenna element 14 is perpendicular to the length direction of the main antenna element 12. And it is perpendicular to the length direction of the first sub-antenna unit 13.

As shown in FIG. 7, the length direction of the main antenna unit 12 and the length direction of the first auxiliary antenna unit 13 are parallel to the first side 111, and the length direction of the second auxiliary antenna unit 14 is parallel to the second side 112. Based on this, according to the rectangular conductive surface 11, the length direction of the first auxiliary antenna element 13 is parallel to the length direction of the main antenna element 12, and the length direction of the second auxiliary antenna element 14 is perpendicular to the length direction of the main antenna element 12. And it is perpendicular to the length direction of the first sub-antenna unit 13.

As shown in FIG. 8, the length direction of the main antenna unit 12 is parallel to the first side 111, and the length direction of the first auxiliary antenna unit 13 and the length direction of the second auxiliary antenna unit 14 are parallel to the second side 112. Based on this, according to the rectangular conductive surface 11, the length direction of the first sub antenna unit 13 and the length direction of the second sub antenna unit 14 are perpendicular to the length direction of the main antenna unit 12.

In the second sub-antenna unit 14 and the main antenna unit 12 illustrated in FIGS. 1 and 3 to 8, the length direction of the second sub-antenna unit 14 is perpendicular to the length direction of the main antenna unit 12, and in other implementations In the example, the length direction of the second auxiliary antenna unit 14 is parallel to the length direction of the main antenna unit 12. As shown in FIG. 9, the length direction of the main antenna unit 12 is parallel to the first side 111, the length direction of the second sub antenna unit 14 and the length direction of the first sub antenna unit 13 are parallel to the third side 113, and are based on It is a rectangular conductive surface 11, and the length direction of the second auxiliary antenna unit 14 and the length direction of the first auxiliary antenna unit 13 are parallel to the length direction of the main antenna unit 12. For example, in the example of FIG. 9, the main antenna unit 12 and the second auxiliary antenna unit 14 are dipole antennas and slot antennas, respectively. Among them, it is worth noting that although the length direction of the second auxiliary antenna unit 14 is parallel to the length direction of the main antenna unit 12, when the main antenna unit 12 combines the second auxiliary antenna unit 14 and the radio frequency signal is fed into the main antenna unit 12 and the In the case of two antenna units 14, the main antenna unit 12 is generated in the direction of polarization in the Y-axis direction, and the second antenna unit 14 is generated in the direction of polarization in the X-axis direction, which is the radiation field pattern generated by the main antenna unit 12. The polarization direction is orthogonal to the polarization direction of the radiation field generated by the second sub-antenna unit 14. The main antenna unit 12 and the second sub-antenna unit 14 combine to form a radiation field-type polarization diversity antenna design.

In an embodiment, please refer to FIG. 10, which is a side view of an implementation aspect of the multi-antenna system 1 illustrated in FIG. 9. As shown in FIG. 10, the system body 22 includes an upper system housing 221 and a lower system housing 222. The main antenna unit 12 includes a signal feeding portion 121 and an antenna grounding portion 122. The signal feeding portion 121 is located along the upper system housing 221 The surface extends, the antenna grounding portion 122 extends from the upper system housing 221 toward the lower system housing 222, and the second sub-antenna unit 14 extends along the surface of the upper system housing 221, that is, in the Z-axis direction The second auxiliary antenna unit 14 is perpendicular to the main antenna unit 12. Furthermore, in the example of FIG. 10, the main antenna unit 12 and the second auxiliary antenna unit 14 are both planar inverted F antennas. When the second auxiliary antenna unit 14 is combined with the main antenna unit 12 and the radio frequency signal is fed to the second auxiliary antenna Unit 14 and the main antenna unit 12, the main antenna unit 12 is generated in the polarization direction in the Z-axis direction, the second auxiliary antenna unit 14 is generated in the polarization direction in the plane direction parallel to the X-axis and Y-axis, the main antenna unit 12 The polarization direction of the radiation field generated is also orthogonal to the polarization direction of the radiation field generated by the second auxiliary antenna unit 14. In this way, the main antenna unit 12 and the second auxiliary antenna unit 14 combine to form a radiation field polarization polarization ( The antenna design of polarization diversity).

In an embodiment, the multi-antenna system 1 is located in the system body 22. Please refer to FIG. 12, the electronic device 2 further includes a motherboard 28 housed in the system body 22, and the motherboard 28 is disposed on the conductive surface 11. The main board 28 is used for setting the wireless communication module 26 and the switching circuit 27. Based on this, the multi-antenna system 1 at the system end of the electronic device 2 is not restricted by the electronic device 2 that requires light, thin, and narrow frame.

In summary, according to an embodiment of the multi-antenna system of the present case, the multi-antenna system includes fewer antennas and occupies less space, and the main antenna unit can be selectively matched with the first antenna unit or the second antenna unit. The antenna unit combines different radiation field patterns to provide the best communication coverage and can be used in today's electronic devices that require light, thin, and narrow frames.

Although this case has been disclosed by the examples above, it is not intended to limit the case. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the case. Therefore, the scope of protection of this case The scope of the patent application attached hereafter shall prevail.

1: Multi-antenna system 11: Conductive surface 111: First side 112: Second side 113: Third side 114: Fourth side 12: Main antenna unit 121: Signal feed part 122: Antenna ground part 13: The first antenna unit 14: The second antenna unit 2: Electronic device 21: Screen body 22: System body 221: Upper system case 222: Lower system case 23: Screen 24: Keyboard 25: Touchpad 26: Wireless Communication module 27: switching circuit 28: motherboard D1: pitch

[Figure 1] is a schematic top view of an embodiment of the multi-antenna system according to this case. [Figure 2] is a functional schematic diagram of an implementation aspect of the multi-antenna system of Figure 1. [Figure 3] is a schematic top view of an embodiment of the multi-antenna system according to this case. [Figure 4] is a schematic top view of an embodiment of the multi-antenna system according to this case. [Figure 5] is a schematic top view of an embodiment of the multi-antenna system according to this case. [Figure 6] is a schematic top view of an embodiment of the multi-antenna system according to this case. [Figure 7] is a schematic top view of an embodiment of the multi-antenna system according to this case. [Figure 8] is a schematic top view of an embodiment of the multi-antenna system according to this case. [Figure 9] is a schematic top view of an embodiment of the multi-antenna system according to this case. [Fig. 10] is a side view of an implementation aspect of the multi-antenna system of Fig. 9. [Figure 11] is a schematic diagram of an embodiment of an electronic device using the multi-antenna system of this application. [FIG. 12] A schematic diagram of an implementation aspect of the electronic device in FIG. 11.

1: Multi-antenna system

11: Conductive surface

111: First side

112: second side

113: third side

114: fourth side

12: Main antenna unit

13: The first antenna unit

14: The second antenna unit

26: wireless communication module

27: Switching circuit

D1: Spacing

Claims (10)

A multi-antenna system having a high-frequency operating frequency and a low-frequency operating frequency, the multi-antenna system comprising: a conductive surface having four sides adjacent to each other; a main antenna unit arranged on any of the four sides Side; a first antenna unit, arranged on any one of the four sides, and the first antenna unit is separated from the main antenna unit by a distance greater than 0.5 times the wavelength of the low-frequency operating frequency Distance; a second antenna unit, arranged on any side of the four sides where the main antenna unit is not arranged; a switching circuit, arranged on the conductive surface, and selectively electrically connected to the first antenna Unit or the second auxiliary antenna unit; and a wireless communication module disposed on the conductive surface and electrically connected to the switching circuit and the main antenna unit; wherein, when the switching circuit is electrically connected to the first auxiliary antenna unit When the main antenna unit and the first auxiliary antenna unit form a first antenna combination; when the switching circuit is electrically connected to the second auxiliary antenna unit, the main antenna unit and the second auxiliary antenna unit form a first antenna combination. Two antenna combinations; and when a radio frequency signal is fed into the second antenna combination, the polarization direction of the radiation field generated by the second auxiliary antenna unit is orthogonal to the polarization direction of the radiation field generated by the main antenna unit. The multi-antenna system according to claim 1, wherein the four sides are respectively a first side, a second side, a third side, and a fourth side, and the main antenna unit is arranged on the The first side and the second auxiliary antenna unit are arranged on the second side, the third side or the fourth side, wherein the length direction of the main antenna unit is parallel to the first side, wherein , When the second auxiliary antenna unit is disposed on the second side, the length direction of the second auxiliary antenna unit is parallel to the second side, and when the second auxiliary antenna unit is disposed on the third side, the The length direction of the second auxiliary antenna unit is parallel to the third side, and when the second auxiliary antenna unit is disposed on the fourth side, the length direction of the second auxiliary antenna unit is parallel to the fourth side. The multi-antenna system according to claim 2, wherein when the first sub-antenna unit is disposed on the first side, the length direction of the first sub-antenna unit is parallel to the first side, and when the first The auxiliary antenna unit is arranged on the second side, and the length direction of the first auxiliary antenna unit is parallel to the second side. When the first auxiliary antenna unit is arranged on the third side, the first auxiliary antenna unit The length direction of is parallel to the third side, and when the first auxiliary antenna unit is disposed on the fourth side, the length direction of the first auxiliary antenna unit is parallel to the fourth side. The multi-antenna system according to claim 3, wherein the first side is parallel to the third side, and the first side is perpendicular to the second side and the fourth side, and the second side The side is parallel to the fourth side. The multi-antenna system according to claim 1, wherein the length direction of the second auxiliary antenna unit is perpendicular to the length direction of the main antenna unit. The multi-antenna system according to claim 1, wherein the length direction of the second auxiliary antenna unit is parallel to the length direction of the main antenna unit. The multi-antenna system according to claim 6, wherein the main antenna unit and the second auxiliary antenna unit are a dipole antenna and a slot antenna, respectively. An electronic device, comprising: a system body; a conductive surface located in the system body and having four adjacent sides; a main antenna unit arranged on any one of the four sides; a first antenna The unit is arranged on any one of the four sides, and the first secondary antenna unit is separated from the main antenna unit by a distance greater than 0.5 times the wavelength distance of the low-frequency operating frequency; a second secondary antenna unit , Arranged on any side of the four sides where the main antenna unit is not arranged; a switching circuit arranged on the conductive surface and selectively electrically connected to the first auxiliary antenna unit or the second auxiliary antenna unit And a wireless communication module disposed on the conductive surface and electrically connected to the switching circuit and the main antenna unit; wherein, when the switching circuit is electrically connected to the first auxiliary antenna unit, the main antenna unit and the The first auxiliary antenna unit forms a first antenna combination; when the switching circuit is electrically connected to the second auxiliary antenna unit, the main antenna unit and the second auxiliary antenna unit form a second antenna combination; and When the radio frequency signal is fed into the second antenna assembly, the polarization direction of the radiation field generated by the second auxiliary antenna unit is orthogonal to the polarization direction of the radiation field generated by the main antenna unit. The electronic device according to claim 8, wherein the length direction of the second auxiliary antenna unit is perpendicular to the length direction of the main antenna unit. The electronic device according to claim 8, wherein the length direction of the second auxiliary antenna unit is parallel to the length direction of the main antenna unit.

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